Assigrnoe to the



UNITED ASTATES PATENT OFFICE..

WILLIAM L. PARMELEE 0E ANsoNIA, CONNECTICUT, AssIeNoE To THE DERBY BIT COMPANY, E sAME PLACE.

vAUGER.

SPECIFICATION forming part of Letters Patent No. 260,497, dated July 4, 1882.

To all whom 'it may concern:

Be it known that I, WILLIAM L. PARMELEE, a citizen of the United States, residing at Ansonia, in the connty'of New Haven and State of Connecticut,- have invented certain new and useful Improvements. .in Expansion-Bits, of which the following is a specification, reference being had therein to the accompanying drawings, and in which- Figure lis a side View of my improved anger. Fig. 2 is a similar view thereof, viewing teeth on its upper edge and a. screw-threaded wheel or worm engaging with the rack of the said bit, substantially as hereinaftcrrnore fully set forth and claimed.

To carry into practice my invention I eniploy an auger-shank, A, havin g the usual form of lip or stationary bit, a, and screw-point a.

In the lower end of this shank is a slot, b, arranged directly above the point c and lip a. This slot is open at one side, as well as at its ends, and the shank has a. flange, b', projecting beyond the bottom and open side of the slot and inclined in the direction of the transverse axis of the shank, and also beveled at right angles to its inclination, as seen in Figs. l and 2.

C is the extensible bit, rectangular in its 4o general form and fitted to slide in the slot b.

Application tiled April 20, 1882. (No model.)

It has projecting from its straight b ase c a lateral tapering beveled cutter, o', also inclined in a similar manner as the ange b', upon which it rests, forming, with a downward-projecting lip, c2, thereon, the cutting-surface of the ex- 45 This pinion or Worm is hung so as to revolve within a second slot, d, ifi the bit-shank A upon a pin or axis, c4, and is capable of ready operation by forcibly moving the foretinger or thumb against or in Contact with the edge or periphery-of the pinion. By this means the bit C can be moved so as to gage the size of' the cutting ot' the hole to be bored.

Having thus fully described my invention, I claim and desire to secure by Letters Patent- 1. In an auger, the sliding bit having a rack or toothed surface and a lateral tapering inclined cutting-Surface, in combination with the worm or screw-threaded pinion arranged in the bit-shank, substantially as and for the purpose set forth.

2. In an auger, the sliding bit having a rack or toothed surface and a cutting-edge, in combination with the worm or screw-threaded pinion arranged in the bit-shank, substantially as and for the purpose set forth.

In testimony whereof I aflix my signature in presence of two witnesses.

WILLIAM L. PARMELEE. Witnesses:

VENENUE MUNGER, DANA BARTHoLoMEW.

The upper edge ot' this bit or blade 

